Gas engine



Jam 27, 1942. Y I F. HAGENMULLER 7 GAS ENGINE v Filed Sept. 28, 1939 2 Sheets-Sheet l Jan. 27, 1942. F. HAGENMULLER' 2,271,006

G'AS ENGINE Filed Sept. 28, 1959 2 Sheets-Sheet 2 Patented Jan. 27, 1942 UNITED STATES" PATENT OFFICE GAS ENGINE Friedrich Hagenmiiller, Nuremberg, Germany, as-

signor to Maschinenfabrik Augsburg-Niirnberg A. G., Nuremberg, Germany Application September 28,1939, Serial No. 297,002

6 Claims.

- tage that the cooling spaces of the cylinders become dilficult of access and when one of such longitudinal stays is to bereplaced it is necessary to dismount the cylinder for changing the stay. Danger to the connecting flanges and at their fillets is also not excluded. Other disadvantages of this construction are to be found in the great expenditure of material and the costly machining, also in the difflculties presented when assembling and dismantling such an engine.

All these disadvantages are overcome by the present invention wherein the entire engine from taking] the water flowing out of the cooling spaces through a longitudinal bore of these staybolts or by surrounding the stay-bolts with a sheet metal sheath and causing the outflowing warm cooling water to flow through the space between the sheaths and the stay-bolts.

When there are only two stay-bolts and in order to keep the stressing of the same equal on both sides of the machine and to prevent any change occurring through one-sided heating, provision may be made, that the stay-bolts will be equally heated by the exhaust pipe and the hot air rising from it. This is effected by mounting the exhaust pipe vertically below the longitudinal axis of the engine.

The two cylinders may be brought directly against one another in such a manner that between them there is disposed only a common cylinder cover which is clamped Germany October 6, 1938 cylinder walls. Preferably only the flange of this cylinder cover will be clamped between the ends of the cylinders, as in this way the overall length will be shortest. For holding the single stuffing box in this cylinder cover the arrangement will with advantage be such that the body of the cylinder cover'is divided into two equal halves, so th'at each half of the stuffing box is disposed in one of these two cover halves. A further feature of the invention is to provide this middle stufiing box with a temperature measuring device, for immediately indicating abnormal heating due to any leakage or lack of oil or the like occurs.

Other and further features and objects of the invention will be apparent from a consideration of the accompanying drawings and the following detailed description wh'erein several exemplary embodiments of the invention are disclosed.

In the drawings:

Fig. 1 is a side elevational view of an engine embodying the invention.

Fig. 2 is a rear end view of the engine.

Fig. 3 is an elevational view of modified means for controlling the temperature of the stay volts.

Fig. 4 is an end elevational view of the engine shown in Fig. 3.

Fig. 5 is a sectional view of means for covering the adjacent ends of the cylinders.

Fig. 6 is a sectional view of a modified cylinder head.

Referring to the drawings there is shown in Fig. 1 an engine frame I which is provided with bearings for the crankshafts. The engine includes a forward cylinder 2, an intermediate cylinder head 3, a rear cylinder 4 and a rear guide 5. All the parts I to 5 are held together by two longitudinal stay bolts 6 and 1 extending alongside the engine, which with nuts engage at the forward end a lug 8 on the frame I and at the rear end a similar lug 9 on the rear guide. Between the cylinders and the other parts there are no connecting screws, stud-bolts or the like.

The warm cooling water coming from the englue is introduced by means of piping l0 into a bore of the longitudinal staybolts 6 and 'l and flows away th'rough piping ll. vThe longitudinal stay bolts are thereby brought to about the same mean temperature as that of the engine and consequently additional stresses due to expansions of the engine and of the stay-bolts, caused by difierences in temperature, are avoided or at least greatly reduced.

Figs. 3 and 4 show a similar high-power gas between the two engine wherein the longitudinal stay-bolts l2 and I3 are solid and heated by a sheet metal sheath It being placed round them and'the cooling water coming from the engine being conveyed through the hollow space formed between sheath and the stay-bolts. The supply is by way of the pipe l5 and the discharge by way of the pipe l6.

In this engine the exhaust pipe is disposed vertically below the longitudinal axis of the cylinders. For this pu pose the exhaust chambers l1, l8, I9 and are connected with one another by pipes 2|, 22 and 23 and through these pipes the exhaust can flow into the pipe 24, from where it passes into the atmosphere. Owing to this position of the exhaust pipe the engine is entirely uniformly heated on both sides by radiation. and by the current of air ascending from the exhaust pipe, so that the stresses inthe two stay bolts are equal. I I

Fig. 5 shows the arrangement .of the cylinder head between the forward and rear cylinder in an engine, in which there is no other intermediate piece between these cylinders. The cylinder head consists in accordance with the invention of a forward half, 25 and a rearward half 26; which are provided at the sides facing one another with flanges 21 and 28 respectively. These flanges are clamped between the end faces 29 and II of the two cylinders, the cylinders being connected in the manner already described by longitudinal stay bolts. In this arrangement the stufling box 3| is disposed in part in one and in part in the other half of the cover and is .held between flanges 32 and 33.

For enabling the temperature of the stuffing box 3| to be kept under observation, a thermom eter 34 is'provided, which extends through a bore 35 into the stufflng box.

A somewhat modified constructional form of the middle cylinder cover is shown in Fig. 6. In

this case there is interposed between the halves 34 and 35 of the cover an annular disc .36 which contains the requisite ducts 31 and 38 for cooling oil and sotorth. This annular disc extends to the piston rod 39, so that the latter can for instance be directly supplied with oil. The

crank case frame, and means guiding the engine cooling liquid adjacent the stay bolts whereby the stay bolts are heated in accordance with the bolts whereby the temperature thereof varies in 10 accordance with the temperature of the engine cooling liquid. V

3. In a liquid cooled engine, a frame, a cylinder, stay bolts holding the cylinder to the frame,

a sheath surrounding each stay bolt in a spaced l5 relation, and means for guiding the cooling liquid from the engine through the sheaths whereby the temperature of the stay bolts, varies with the temperature of the engine cooling liquid.

A 4. In a liquid cooled internal combustion en- 20 gine, a frame, a cylinder mounted on the frame.

cooling liquid from the engine along the stay bolts so that the temperature thereof varies in 5 accordance with the-temperature of the engine cooling liquid, and an exhaust pipe disposed vertically below the axis of the cylinder whereby the 5. In an engine, two axially aligned cylinders,

a divided cylinder head mounted between adiacent ends of said cylinders, a piston rod extending from one cylinder into the other cylinder through an opening in the cylinder head, a flange carried by each part of the divided cylinder head,

stay bolts'clamping the adjacent ends of said cylinders against said flanges, and said cylinder head having a stufling' box formed in both parts thereof adjacent the piston rod.

40 s. In an engine, two axially augnea cylinders,

a divided cylinder head mounted betweenadiacent ends of said cylinders, a piston rod extending from one cylinder into the other cylinder through an opening in the cylinder head, a flange carried by each part of the divided cylinder head,

stay bolts clamping the adjacent ends of said cylinders against said flanges, said cylinder head having a stuffing box formed in both parts thereof adjacent the piston rod, and a temperature measuring device carried by said cylinder head for determining the'temperature-of said stuffing box.

FRIEDRICH HAGENM'ULIER. 

